I don't know, I demoed an Exmark 66" Triton with a 27hp Kholer and it seem to blow my w/b's time away! One property that usually takes me 15-20 minutes to mow with a 48" w/b took me less than half that time with that ZTR. My trimmer guy was still in the front when I was done mowing, and usually he's almost done with the back side when I'm finished mowing with the w/b. There is more than just the speed factor at least for me. One is bagging capacity- any w/b will only bag what? 3.5 cubic ft. where as a ZTR even with a dual bagger is double if not triple that number. So to me right there I'm gonna save probably at least 7-10 minutes on an average lawn with walking back and forth emptying the bagger. Thats huge for me time wise because I am p/t with around 50+ weekly accounts to mow and this time of year daylight is becoming scarce after 3pm. But like you, I am having a hard time justifying 10k instead of 5k for a 52" w/b. I am leaning towards a 50" Exmark with a 27hp Kholer and bagger with a stripe kit though.
J and B Lawncare:
On our own as of 2003. Proud to be a full time, legitimate company.
Equipment we use:
Pro Line and GatorMade trailer's
Gravely, Exmark, Honda and Snapper mower's
Echo trimmer's and blower's
New Holland and Dresser loader's (snow removal)
Fisher snow plow's
DownEaster and Fisher salt spreader's
TurboTurf fertilizer tank