I'm sure the ones that won would think it was fun.

But the truth, the odds are so low that it should not have been worded as,"The entire staff at Renderosity would like to extend our gratitude for your business."

You should have said it was a holiday special or bonus or contest. Not a thank you. 

Just to give you an idea of the odds of getting a thank you prize if your lucky. I have been here since 2001 and have a very long purchase list. Only 2 times in all those years and products is there a 23 on the end of the invoice number. Not very promising is it.

Something like a 25/30% discount on a purchase of $30 would have been better, even useful. As for spending $30 for the extreme off chance of winning $10, not worth it.

All the statments here are MHO and may not reflect the same opinions of the chosen few.