Since most of his guests ignore him, why do they come to gatsby's house?

Because he's rich: They accepted his hospitality because they could eat and drink freely, and just overall have a good time.

Answer by YourHope:

since most of his guests ignore him, why do they come to gatsby's house?

They accepted Gatsby's hospitality and they could be merry and drink and eat.

:)

the cost of college has risen faster than inflation for many years.

the high price of student services and administration are two reasons for the rapid increase in cost.