While I appreciate and share the DIY spirit, some doubts have been creeping in recently.

Firstly, in most cases we are just DIY'ing the final "craftsman" step of the work, we still depend on the materials being available.

Second, if more and more people that actually care about work quality go DIY it leaves people who can't or won't be as involved. Over time unscrupulous tradespeople will take over the market.