I would not want to be pushing 240V anything around on possibly wet grass, especially if it was made by a lowest-bidder subcontractor in China. Would you, really?
1. I don't mow when it's wet.
2. 240V isn't THAT much more dangerous than 120V
3. 240V can push almost double the wattage over any given gauge cord, or you can keep the gauge the same and run it further(useful for a lawnmower).
4. It's done all the time over in Europe. I saw a number of 240V models browsing sites over there
5. I want a full size deck, preferably 24-26". I admit that that'll take more wattage than can be easily pushed over a 120V extension cord. Having to go with 12 gauge isn't as friendly.
6. I wouldn't need to wear hearing protection(Yes, I know, I have a fancy collection of ear muffs for shooting, shouldn't be a big deal...)
7. No need for gas, oil(maybe some grease), filters, etc...
I don't need a fancy type, but if they come up with a different design that cuts a nice wide swath with reduced power needs, I'd be all for it. Also, I only mulch. No need for the ability to bag.