I've found that purchasing TCredit packs is the best way to build one's SFI business.
1) Set up a Standing Order for a TCredit pack to improve or maintain your current level.
2) Use TCredits to gain VP and MRP playing Zebra games and bidding at Pricebenders.
3) Give TCredits to PSA's and CSA's to help them build their business.
I hope this answer helps you all and wish you happiness and success.