Money!!!
Hello; Nodeling didn't get too expensive for me until I started buying four strokes. I just had to have everything available from each maker. I'd hate to think of the replacement cost of all the engines I have sitting on the shelf. I have 20 planes ready to go, all with 4-strokes. My wife doesn't complain about it unless I make her come along to the store. I would guess at maybe 12,000 accumulated over 12 years. $1000 a year, not too bad, I pay more then that for insurance on my motorcycle.