Limiting the # of groups to 25 basically limits the interests of your customers to ONE! If you have 2 or 3 interests, like most of us, you need an alt to follow up on all your interests! Most people are unwilling to endure additional hassle - especially for something they do in their spare time for pleasure so they just miss out.
THIS COSTS YOU MONEY!!!!!!!
Personally, I spend money on Burlesque, Fashion, Hunts, and vocalist/music interests in Second Life. Currently I am only subscribed to a fraction of the groups I need, I rely mostly on subscribe-o-matics which are NOT as useful and don't have half the benefits that groups do, and therefore aren't offered by most.
The ridiculous group limit is a constant issue ALL users and has been since I joined in 2006. THIS LIMIT NEED TO BE INCREASED DRAMATICALLY!!!!! I am shocked that hasn't happened already, frankly.