You are wearing a signature now because you will get paid, Retegui like many players work for themselves and their family, many players comes from impoverished family without hope except for football so they don’t just play for passion they play carry the weight of their family survival on their shoulders.
Footballers knows their time playing football ticks very fast and if they get broke we would criticize them. Retegui is not commenting any crime going to Saudi Arabia to go after money, as much as he wants to play in Europe but no European club is willing to give him close to what he will earn at Saudi Arabia and we will have to respect every decision a footballer makes.
Retegui went for only three years contract so he is not even staying that long, perhaps since everybody is taking about his money mentality maybe he just wanted to use this three years and do something different, actually I think his mind is not for that long if not he could have taken a longer contract than this but if after this three years he is still in the Saudi Arabia then is obvious. Although your suggested family responsibilities could make someone who isn't receiving the way they wanted to to go for higher pay in other to stand on any family bills. Of course he doesn't commit any crime about his decision and he has the right to do so.