I'd think it rather common that all people of importance in a realm would naturally gravitate towards a ruler's court as the seat of power in the kingdom. That's more or less how a court functioned in the middle ages. It was also the source of knowledge, art, fashion, balls, dinners, tournaments...
Being at court means having access to the ruler, favors, privileges, influence, potential brides, husbands etc etc. Being back home in "Backwaterwille" would mean either self imposed isolation, semi-exile, not caring about politics, disfavor...
Is it safe to assume that this works somewhere along these lines in RoE? That, for example, powerful vassals leave the day to day administration of their domains to their seneshals/chamberlains/spouses while they pursue their interests at court?
I.E. I'd like some inner-realm intrigue (a level that doesn't overtax our DMs much) and having a larger court expenditure would probably ensure that my vassals do spend time there (or don't and then I'd want to know why) and that I can talk to them regularly (without a diplomacy action when its things like advice or general pleas, audiences etc).