It's cheap and easy!
I was fed tea (mostly milk of course) as a young 'un, and have stuck with it. I find coffee too bitter, though I imagine I could get used to it. Tea gives me the caffeine boost that I'm now used to. All you need is a kettle (which will last for years) and a teapot (which will last for decades). Far simpler than some coffee rigs. And, I believe it is a lot cheaper than coffee.
The one downside for me is stained teeth (not nearly as bad as smokers, and I imagine coffee does it too). And perhaps a few more bathroom breaks...