What I've heard from some friends in the installation industry is that their work is dominated by large installation projects that will become huge money-makers for the owners in a reasonably short time frame, so it's worth the big up-front cost.

The panels are quite expensive and the labour is not cheap, but when you're installing 50-100+ panels on a big box store roof, it seems the economics far more than works out, at current energy price and subsidy levels.