A lot of this is going to be down to managing expectations.
If you tell a player to expect a $100 bonus and he goes there to find its now $20, he may not sign up. If you use bonus data in big bold letters to drive players, you’re more likely to attract one-time bonus hunters. If you fail to tell them a casino takes 5 days to pay out, then retaining them may prove difficult. Etc etc.
Thus, software is probably less important in th scheme of things than being up-front IMHO.
Just my $0.02 
Simmo!