Looks like they are selling "white label" casinos. These allow a webmaster to invest into the business more cheaply than if they started their own casino from scratch, but of course have a bigger and established casino manage most of the running, such as deposits, withdrawals, etc. You would be able to have a custom lobby, but this would simply be linked to the main casino. You would get a % share of what your players lose to the house, and you would be responsible for marketing your particular branded lobby.
Generally, seasoned players do not like these white label "skins", as they do not believe they offer the same level of trust between player and operator.
MG also offer white labels, and at least this software is more trusted than the likes of
RTG and E-Soft. Some Grand Virtual casinos are accredited here, but I was not aware they were offering white label casinos.
There are many sites offering VERY cheap do-it-yourself casinos, but these are generally offering cheating software that can be set to guarantee a set profit for an operator, and thus make it largely risk free even when run by a seriously underfunded business.
Players who have been around for a while know these cheating softwares, and will warn off players, so anyone wanting to stay in the industry long term, and be trusted, should steer well clear of such offerings, and raise the funds needed to enter at a more trusted level.
South Africa is an interesting market, as I saw a thread recently that said there had been changes in the law there to make online gambling more "mainstream". The EU is a mixed bag, with some countries trying to ban it, and others regulating it. America is hard, technically, the authorities believe it to be illegal, and will make it very hard for a new operator to offer services there, but unfortunately this was where most of the players were before UIGEA, and the player base is not as great as it was a couple of years ago, and some established casinos are now feeling the pain, with one notable failure recently (Casino Action).