You can make a long term profit, and casinos know this. You can see this by reading the growing list of seemingly illogical terms and conditions. The key to making money is the way casinos use bonus monies to attract deposits. Without this, there is no long term method (other than fraud) for making a long term profit from casino games.
You will know when you have stumbled on a method that probably works in the long run when you suddenly find yourself getting bonus banned, or your playing style audited more closely upon withdrawal.
Many of the methods being published for free on the web, or even sold as "systems", either do not work, or have been banned long ago by the casinos.
The list of excluded games many casinos have for bonuses is a list of games that from past experience the casino has suffered a long term loss from when played with their bonuses. This list grows all the time, showing that as new methods to beat casinos are developed, they get banned long before they become common knowledge.
The earliest systems to beat casinos long term involved taking welcome bonuses and playing Blackjack, grinding out the WR for an expected gain over the long term. WR was increased to a level that this would no longer work, and so along came the big starting bet method, where a win was followed by grinding out the WR as before, but from twice the starting balance, and still for a long term gain.
There are now terms appearing that regulate slot play, even ban some slots altogether. This happens because advantage players started attacking slots with their systems, and found a few where the RTP and variance profile could be used to produce a long term gain. Some excluded slots make no sense at all, yet are seen in the terms of several casinos.
The Microgaming slot "Double Magic" is getting banned right across the quickfire platform for bonus play, yet this is a low variance slot, and not a particularly attractive RTP. It also has clones, same paytable and variance, yet they are NOT banned for bonus play. There has to be something "Magic" about this one slot that makes it extra special on the Quickfire platform, but just ordinary in a regular MGS casino. If there is a way to make long term profit from it with bonuses on the Quickfire platform, it no longer works because the terms ban it, and any profit would be voided.
The question therefore has 2 answers.
1) Yes, you can make long term profit using certain strategies.
2) No, you can't, because you will keep getting tripped up by the terms when you win, having the profit confiscated, but when you lose, you will take the hit in full, even if you could never have won due to the terms.
If there is a method that works, and has not been banned by the casino, no-one is going to tell you what it is until it IS detected and banned (with the exception of NewOrleans, who outed a working RTG advantage play system that was still alive and kicking, which got banned soon after by RTG removing the games it worked on).
The MGS "Chief's Fortune system" got banned after 3 months of such heavy use that the monthly stats got so skewed that it had operators investigating what was going on. This system DID meet your full criteria, no bonus needed + long term profitabilty. It was a software glitch that caused the game to pay well in excess of 100% RTP on every new account created until the bonus round was triggered for the first time. Thereafter, RTP was normal. The system was to deposit into a new account, claim no bonus, play till the bonus round hit, and then withdraw. Quite a few players decided to carry on after they had done it at every MGS casino by creating duplicate accounts using false details. This is what quickly lead to the system being discovered by MGS and stopped.
The lesson is an important one, if you have a system, don't get greedy, and don't tell.
There are those that have made a long term profit, and they will have been using strategies. It does not follow that the strategies led to the profit, it is probably down to luck, and knowing when to stop pushing it
