But why would you buy and not rent ?
Do you shoot that often ?!
Honestly, I'm not an expert at anything. I'm teaching myself something everyday. To be even more honest, I find, that many of the "experts" who work with me, also don't always know what they're talking about.
I know this dude, who decided to 'trust' all the experts, and he shot a movie and spent a tidy sum renting a red camera. What happened was that nobody knew how to operate it. So there was a lot of learning on the job. So the red camera was paid for and the potential not fully realized.
So the lesson for me from this experience, was, "I don't need a red camera. But I need a semi-decent camera. But I need to be able to exploit its potential to the fullest. I can only do it by using it every chance I get."
I came to this realization also after doing the little shoots that I do. Everytime I do a shoot, some mistake, some setting not being checked prior to shoot, some absolutely dumb mistake, keeps popping up, EVERY time. So my checklist grows everytime I do a shoot, and the next one is always better than the last. But there are still mistakes.
Why do I want the Kessler dolly? Because I've used a dolly system only once and I'm not sure I'm an expert at renting and setting up and using it. I was lucky the last time, because my DP really knew what he was doing. But the Kessler Dolly system is cheap enough (It cost me $1200 to rent the dolly system last time for a DAY), where the money is worth it if I can teach myself continuously.
I don't know. I'm just trying to rationalize in my head why I want to buy it as I try to answer your question. I think buying makes more sense at this price level, because I can constantly fiddle around and learn. If I didn't own what I do, I'm pretty sure that I wouldn't shoot the little amount that I do. At this moment it doesn't cost me anything to shoot other than feeding a few people, cause I already own my camera.

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Do I do enough shooting. I don't think so. I'd like to do more. But I don't think I'd shoot even the amount that I do, if I didn't own what I do. I don't know what to say. I just became sad writing this.
I need to shoot more

Aveek