Potential new player but I have a concern.

I'm thinking of getting into EVE online. I played a bit yesterday and I'm interested in playing more but... I have read that EVE basically needs multiple accounts and that concerns me.

I already think that the EVE sub cost is too high being double the mmo standard. I am willing to pay that for one account... but seeing as you need to have all accounts subbed in order to play them I feel like it's beyond too much.

I did some looking around and I can't quite understand the benefit of multiple accounts beyond pretty much everywhere saying that it's useful. Can someone explain to me what they are used for and how much of a disadvantage I would have if I only use one account... or if only one account is subbed.

Also, the character I want to use as my main was originally created 6 years ago. Would this be a problem for people if I tried to join a corporation? I know that this game has corporation spies and such.

I feel like a new player on a six year old account make make people suspicious.

EDIT: Really fast and helpful replies in this subreddit. So basically by the time I would even feel like I need a second account I will already be into the game enough to justify the cost. I'm not really concerned anymore, gonna go play some EVE now.