Yes, indeed, if anyone wants to try it, bet around €6 on 50 longshot players and see how far it would go - he's more than welcome, it's a risk of €300 but then if you get 1 or 2 players reaching 20 or less then you already cover the €300 risk (if you get 5-6 players then you can hit €1800) - but it's risky, and you might want to close the position at 50 to 1 or so.
It's interesting for sure, but requires discipline, luck and and to be hands on on it.
I suppose the same can be said for some American sports (basketball/football/baseball) as I seldom see the preseason favorites ending up winning and then you see odds change so drastically from 300x to 20x just over the course of quarter season. I think baseball especially.
I definitely thought about this style (to keep betting on longshots and adjust betting as others become longshorts) but the discipline, time,,, and willingness to keep doing it even after losses on first attempts. I would merit that type of thread a lot!
The data is needed for sure before we can conclude efficacy.