As time goes on, transaction costs are commoditized due to competitive pressures, Most transaction fees in these markets gravitate to nickels and pennies, if not less.
This is one of the best takeaways I've gotten in a while and may be the most damning insight into the Groupon model. Right now it barely[1] works with 50% of the revenues on a Groupon can it still work at 10%?
[1] I say "barely" because Groupon is still losing money but its doing so intentionally in a huge growth phase and land grab once it settles into its actual market a bit this can easily swing into "doesn't" or "successfully".