I think you might be able to sell cashstacks.com to some MLM'er or an advertising bussiness online. Ive been able to sell 2 of my Domains to people like that at around $40 which is nice.
The reason I thought ducats.net might be interesting is the slang use of the word, "tickets", which I've heard used a lot. The internet has is limitations for business, but I think buying tickets online will only get bigger.