Out of 7 times on the mountain I've never carried a beacon, but I've never climbed in bad avi conditions. If conditions warranted a beacon I would just drink beer in town.
The climbing season usually starts in late May, but it's different every year. I'm not sure what the snowpack is like this year. Check the Rainier climbing blog regularly to find out what climbing conditions are like, keep an eye on the weather, and make sure you know what the avi danger is before you set out. Weather has always been the crux for me! Good luck!
I carried a beacon and summited rainier last June. We were skiing though, so we approached the objective with that mind-set. Most of the time the snowpack was bomber, but there were definitely moments of exposure to higher hazard during which I was happy to have it. Specifically significant warming late in the day increasing the likelihood of loose-wet slides on slopes we were ascending/descending. Doesn't seem crazy to me at all. It's a valid point that if your partners are beacon-less, it's doing you less (though still some) good.