I own both clones and authentic's. If I can get an authentic, I'll go for it, as long as it meets my budget. But sometimes, authentic's are not easy to find, even if budget wise, it's feasible. In those instances, I'll go for a clone. Good clone companies really mimic the authentic's well, with maybe the slightest of differences.
I get authentic's where I can because I want to give homage to the creator of a device or atty. Also, I enjoy having an authentic. There is also the point that an authentic's resale value usually has you breaking about even, if you should ever choose to sell or trade it.
There is also a peace of mind aspect to an authentic. Some authentic's come from companies that really stand behind their products. If and when you break their product, they'll have the means to repair it. You'll hear plenty of Provari and Reo fans here talk about the service level they get. A clone of those products won't have that support. When the clone dies, you just go get a new one. So in those instances, a clone just doesn't make sense.