1) The same reason I switched to chrome multi-clamps - presentation. I don't want to see the velcro wrapped around the crossbar. Looks cleaner without it.
2) I don't want yet more things to attach/unattach upon setup and breakdown.
I started going this way since putting my Mapex Saturns on the rack. Surprising how much a few wires can really make a setup look unorganized, and cluttered, even when they are bundled together or strung nicely. Wires are just unsightly.
LOL. I'll PM the address to ship them to, so you don't have to worry about the garbage man.
It wasn't only the resonance that prevented me from mounting mics to my rack, although that kick drum experience sure raised red flags for me in that regard. There were several other reasons, that when combined together, made it so that it just wasn't worth the headache:
When a tom is struck and the tom flexes down, and back up again, the changing mic-to-drum distance surely can't be helpful to sound, to say the least. And, while Gibraltar has these offerings, they are all based upon the same adapter I was talking about. While it's ok for overheads and vocal mics to jiggle a bit due to the rubber in the mount, I didn't think adding some mic jiggling to the tom flex equation would make sense.
http://www.gibraltarhardware.com/?fa=partsdetail&curcat=2&bnd=11&cid=115&sid=437&pid=1469
This said, perhaps the Gibraltar rubber shock mounts will help enough to tame the vibration just enough for you, and you can use drum-mounts on just the larger toms, which flex much more than smaller toms. I, personally, wanted a consistent look, so did not try this, and it's likely I did not spend much time researching other vibration-reducing options. (Who am I kidding? Of course I did!)
I do understand where you are coming from, and you will probably try even things I already tried, just to know for sure yourself.
Also, extra mic boom arms makes for even more hardware to deal with, and I'm all about trying to minimize setup/breadown efforts, within reason.
I certainly know about space issues, too, because if you recall, I used to run two rows of drums/triggers, so fitting mics was definitely an issue there, for sure. So, when you said you didn't like the placement of the mics when drum-mounted, maybe a different mic clamp would help in that regard? I researched the heck out of drum-mount clamps, and there are a ton of options out there, and while I could've spent a ton of money trying them all, in the end I compromised, and ended up with a very good solution for my needs. Maybe these will help?
http://www.drummerworld.com/forums/showpost.php?p=891239&postcount=6