Slippery slope , blah, blah, blah. Been hearing this since 2008. Still waiting. Refer-a-friend stuff is limited to the referral, doubt we will see it on the shop. Same with the preorder bonus.
Even still, there has hardly been this overwhelming increase over the 11 years the shop has been active. But go on, keep screaming the sky is falling or that there is a wolf, whichever you like best.