The money makes sense considering there is a team to be situated and money/art/coding isn't a "free" thing in a vacuum most of the time as at the very least there is an implied cost for time and an unspoken for "Well, you already have all the competent hardware and dev software licenses right?"---in ADOM's heyday it was a student project when Biskup literally had nothing else aside from it and school to contend with in an era very different from nowadays both in terms of the internet and all else. Fast forward a good number of years and he's got a company to manage, a marriage/house situated, and suddenly all the student time/energy just isn't there anymore on top of the original game being a nightmarish series of old school C hacks barely held together.
You see much of this in the game dev community..."old timers" still trying to make it work, however they can, even as their numbers dwindle due to the horrific burn out rate in the mainstream industry at large. The way I see it Toady and Biskup have their own respective situations, and as such comparisons between their respective methods just don't pan out ultimately as each is very much a product of different times, locales, life experiences, etc.
That said, him having to use IndieGoGo instead of Kickstarter definitely did not help matters as IGG just doesn't have the visibility and audience as KS.