In wargaming there is a principle known as “The Fuzzy-Wuzzy Fallacy” and without going into excruciating mathematical detail it’s premise is that quantity relates to quality at a better ratio than you might think…specifically a unit with 2X firepower is not worth 2 opposing 1X units but rather the square root of two because the guy with the BFG9000 can still be pwnd by a single low-tech arrow. [see: Pippin’s comment on Boromir].
How this applies to app development is simple:
App customers are absurdly cheap.
Ergo: multiple, inexpensive, interlocking projects stand a better chance of making a profit than a single expensive project.