The number of spins on Bonanza and WWTBAM mean diddly- squat and are just a ruse used to dupe players into believing "Well gee ma, I gots myself some more spins! hurrr durrr!" when in actuality,
you're just as likely to win from small multipliers and few spins.
In Bonanza's case, most,
if not all of my best wins have been in the 6-10x multiplier range, and whilst the visual appeal of seeing +5s strewn everywhere is wonderful, more often than not they're worthless anyway, as the game 'magics up' Dead Spin Central towards the conclusion of a bonus round.
Also moot considering these bonuses serve to 'add' more spins with each accompanying win anyway, so there you go, there's your fecking extra spins. BTG should be ashamed for encouraging the attainment of more spins as an optimal strategy if anything, but then self- awareness was never really their strong suit