Jazz you've missed my point, lots of people view welding as a bit of a black art, those that do weld know it is not so but you won't convince many when your talking about constructing a machine where it's such an integral part of the build. Arc is probably the hardest to learn as well especially with a cheap machine where it is difficult to set current correctly.
Not for one minute suggesting that it is not an option but if you are looking to cater to a wide audience then the downside has to be taken into account. Same with cutting ally, is the idea to produce an accurate machine that is better than what is currently available at a reasonable DIY price or a machine that is fit for business use which obviously ups the budget.