Bro I don't compare La Liga teams with Serie A teams. I know other teams in La Liga other than Barcelona and Real Madrid don't spend a lot of money building squads. Madrid and Barcelona spend a lot of money and are two of the best teams in La Liga. But there are many teams in the Premier League who are very rich and spend a lot of money. Manchester City, United, Liverpool, Arsenal and Newcastle are very rich clubs. And the Serie A teams will be far behind these clubs financially.
I understand what you mean but the important thing here is that LaLiga, Serie A, Premier League have their own advantages and in these 3 standings they also have their own best players and regarding finances they also have their own wealth.
So we don't need to compare or talk about this because Serie A has the best club Napoli, Inter milan, AC Milan and LaLiga has the best club Barcelona, Real madrid and in the Premier League has the best club Manchester city and Arsenal.
In each standings, of course, they have different wealth and different superior players, but here I think that all clubs in any standings are just trying their best.