It was their bad management strategy to gain as much as money they could. Selling star players and buying young unknown players, seems that they were not aiming for any titles in the past. But I think they have changed their strategy by bought Alexis Sanchez with high price.
They sold their players because they need money to survive the tough league. Apart from that they will need to make zure that the board director get money from the players however they dont do that kind of thing anymore because they have had enough funds to survive . Playing in champions league is actually a good source of revenue, arsenal is the most consistent team in premier league that play in champions league every year
But as you say should Leicester could become an example of motivation for other teams Without label expensive players Leicester can occupy the top positions of the standings to date. I hope Leicester do not sell their players who are to be the target of other teams