In the interest of objectivity, I'm obliged to make a few comments...
49% kits are around $29K with most of the goodies. Add avionics, engine, paint, trim and accessories and you're flying a brand new airplane that you can land on a sandbar or ORD (maybe) for around $80K.
Lessee, $29K for a 49% kit, $25K for a rebuilt O-540, $6K for a prop, $20K for instruments and avionics, another $10K for a nice interior and paint. (equivalent to a factory aircraft) plus some odds and ends the kit never includes and assorted shop tools and supplies, plus having a suitable shop to build an airplane this size in. You'd have to be a pretty shrewd shopper to come in at less than $90K were you to do a really professional job.
Now factor in that most folks have never built an aircraft, nor have extensive experience in working on one. While the structure itself may in fact be pretty simple, the time consuming details are in the plumbing, wiring, controls and finishing. I don't know if you've ever built an aircraft, but I've helped build several from plans and a stack of 4130 and spruce. By yourself, you could spend 8 years building one. With a "50%" kit, at least 4 years by yourself and without any prior experience. Many take longer. And at the end of those four long years, you have what? A new airplane true, but one that really doesn't out-perform a 30 yr old Skylane except in short-field performance and adaptability to skis and floats. Also on the plus side, you should be able to do all your own maintenance on the aircraft.
On the minus side, you have an airplane that is likely to depreciate over the next ten years (should you decide to sell) rather than appreciate as Skylanes always have. Also, check with your insurance agent for a quote on a $90K taildragger homebuilt vs that 30 yr old tricycle-gear "spam-can" with the superb safety record and availability of spares. Especially if you don't have 200 hrs of similar taildragger experience. Then tell the insurance guy you plane to put it on floats and skis as the seasons change. Make sure you're sitting down. Oh, and if you'd simply plunked down $75K for a Skylane, lets mention that you could have been flying (not building) and gaining ratings and experience for those four years.
I have nothing at all against homebuilts. I would like to build another some day. And it will likely be an expensive toy, not a cost-effective replacement for a factory aircraft.
All the good folks who market kits ARE in fact, in the business of SELLING something. They naturally are always going to put their kits and the homebuilding process in the most favorable light, and minimize the pains and costs associated with same.