Depends on how often the WOT bug gets you and what kind of terrain you will be driving on. The rougher the terrain and the bigger the jumps, the more $ it will cost you to play there.
If you want to play in a flat smooth area with minimal jumping and minimal objects to smash into, it will obviously be cheaper.
It's hard to put a $ on 1 hours worth of driving. On fuel alone, you will be spending anywhere from $5-$10 on constant running. Then there's tires, bearings, engine wear... and this is if you don't smash into something.
I don't know the truck your looking into, so it's hard to judge what will break on you the most often and how to avoid it. Typically, it's the arms and the shock towers that go first. That's anywhere from $6-$15 depending on how many you break.
It's not a cheap hobby, but it is a rewarding one. The more effort you put in, the more worth it it seems.