That's because we weren't talking about the VIP program.  We are talking about your lines, which you've promised for five+ weeks now to "tighten up".  For you to say "we have great lines" and then I say "they are worse than anyone else, what are you doing to make them better" and you to retort with "we have a VIP program!" is called moving the goalposts.

But let's look at the VIP program and see how it fits into the lines.  I'm at Silver2.  In order to get to that level one would have to wager 1,000,000 chips in the sportsbook, or 1000BTC.  Being at that level, I get .4% betback and 4% lossback.  So let's investigate what would happen if I bet using a 1BTC unit size on each side of the game on all the books that I listed:

Your line is:                   Philly +158/Cincy -196

I bet 1BTC on Philly to win 1.58BTC and 1.96BTC on Cincy to win 1BTC.  If Philly wins, I lose .38BTC + .008BTC betback and +.0152 lossback max (since your lossback is on the total won/lost for the day, not on each losing bet).  = -.3568BTC. 
If Cincy wins, I break even on the bets and get no lossback and get .008BTC betback = +.008BTC

Your bitcoin competitors:

Philly +160/Cincy -178 

I bet 1BTC on Philly to win 1.6BTC and 1.78BTC on Cincy to win 1BTC.  If Philly wins, I lose .18BTC; if Cincy wins I break even.
                                   Philly +158/Cincy -179 
I bet 1BTC on Philly to win 1.58BTC and 1.79BTC on Cincy to win 1BTC.  If Philly wins, I lose .21BTC; if Cincy wins I break even.
                                 
So as you can see, even with a lossback and betback rate that has come after wagering 1000BTC, the odds are still not in your favor.  The tiny couple of hundreds of a coin I'd stand to profit from the favorite winning doesn't overcome the tenths of a coin I'd lose more than your competitors if the dog wins.  You can, of course, do this same math only betting on one side and for the betback/lossback to make up the difference you'd have to wager hundreds of coins (which is over your max bet), in addition to having to have had previously wagered thousands of coins on bad lines in order to be at the appropriate rewards level.

Again, it's just not competitive.  I love your site but your lines need some major work before they are competitive and worth betting on.