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Yes, its dumb to make out deposits directly but there are indeed people who do accept the risk just for them to prove out something that they do have in mind.
Lets give thanks on them sometimes yet they do save up people on doing that part.
I can't imagine such situation, to be honest. Finding a random sports book online and making a deposit straight away? Unimaginable. Why don't spend 20 minutes on your research first? And I don't mean Google, it's hard to figure out what's legit and what's not there sometimes. I mean this forum, bitcoin-talk.org, where you can just ask about a reliable sports-book, and you'll get your answers pretty quickly.
Top of that i agree your point by direct entry in the random sports book and secondly i will recommend to make as much as possible time in research use tools if you are not familiar to that then stay away from such kind of entries and also if you want be the part of it make sure to learn about the basics. Defiantly a small amount as well worth a lot especially in case of the investments.