15. Gilbert Arenas' Shark Tank
Cost: Part of a $1,000,000 pool complex + 5,000 in monthly repairs
The painful realities of today's real estate market effect everyone, even athletes with $111M contract extensions. Arenas spends years turning his D.C.-area mansion into a backyard version of Nelly's "Hot in Herre" music video, complete with a sex grotto, water slide, and exotic shark tank. After thousands of trips to the Home Depot, Arenas finally finishes his project and is promptly traded to Orlando. Now he's out of the league and all he has is a bunch of sneakers and that shark tank.