I think there was a guy on here that claims he can get 250 ectos in 5 days or less by soloing UW. If that is the case, then I guess to those few people, then 500 is nothing. Of course most people thought he was farfetched and laughed.
I'm pretty sure most players will never have 500 ectos in their posession at the same time, especially with the playerbase being mostly casual players.
I myself am down to 1 Ecto and have been for awhile. I believe that I said before that I have gone out of my way to even naming my one and only ecto. I named him "Ecto 2". In a thread awhile back, I told my short story about how one day how my proud little ecto came up to me and said "How come I am named Ecto 2 when I am the only Ecto you have?" I replied to him by saying, "because you'll never be..

"
But yeah...500 is a lot for a lot of people. I like to help people out a lot, especially guildies, so getting ectos sometimes gets put on the back burner. I find it more rewarding helping people than seeing my inventory of 500 ectos. I'll get things at my pace, so I'm never discouraged when someone has more of something or something better. Yay for them. All I can say to that person, is have fun with the ectos.