I don't want to burst your bubble here, but I really think you are looking at the wrong equipment. First off you will never make any money trying to mow lawns with a BX, especially the size lawns you are doing. You need to look at a commercial zero turn mower. That's the only way you will be able to compete in price with the competition.
Second, a blower on a tractor also can not compete with a plow on a pickup. What a pickup can do in 15 minutes, would take 2 to3 times as long on a tractor/blower.
Now you have to consider transporting the equipment from one job to the next. As far as a pickup/plow, you finish and go. A tractor needs to be loaded on a trailer and chained down. It takes me a good half hour to do my
B26. In that time the pickup already plowed 2 more driveways
The same with mowing. With a zero turn you drive it up on a landscapers trailer and go. No time wasted strapping it down.
A tractor/blower set up is great if you are doing a development where you can drive it from house to house, but if you need to transport it around town all day, you will get killed with wasted time loading and unloading.
Just my opinion, hope it helps with your decision.