Hi IGotYourOuts,
PokerStars offer you additional bonuses when you earn sufficient fpp points by playing poker on it's software. I believe some bonuses can also be bought by spending your fpp points too, but it will depend on your VIP status.
As MatejM47 indicated, this is probably something to look into but after you have cleared the first matching bonus that PokerStrategy.com provides as you will only be able to clear one bonus at a time.
Again as MatejM47 has already stated VPP are solely used to determine your VIP status and are reset each month/year, FPP's on the other can be spent on bonuses, entries to certain tournaments or other store items.
A higher VIP status will help you to earn more FPP faster.
Hope this helps. Good luck and enjoy your poker on PokerStars.
Best regards,
Bart