We hear there were actually two companies who chose to forgo this week's Demo conference and present at Jason Calacanis and Michael Arrington's TechCrunch40 conference instead. The startups in question? Media-sharing service Wixi has confirmed that they will not be presenting at Demo, and we hear that avatar service mEgo is also off the list. (Two flacks for mEgo didn'tt return our call from this morning and sent us straight to voicemail when we followed up a few minutes ago.) Both companies presented onstage during Tuesday afternoon's "Rich media and mashups" section. If Demo followed its usual cancellation policies, these companies would seem to have lost their $18,000 entrance fees. (Representatives for Wixi had no comment on the fee.) We hope these two companies were able to get a worthwhile experience from TechCrunch40. They may not have won the $50,000 grand prize, but they learned something about the value of a contract.