Why don't keep it for you ? If your list is good, you should'nt sell it.. start a niche that are good for your emails list and try to get new customers with yours mailing list. People don't purchase emails lists because must of the times.. it's shitty emails (spammed emails)
It is better to use it for your personal use. USA email list is very valuable if it not spammed emails...
You can't. those who opted in to your list, did not opt in to the person you will be selling it to. So, if anyone buys your list they will basically be spamming. al
Who are these people in your list and if you know what they are interested of, you might want to earn from them by offering something from affiliate program. Make use of your list.
What I'm interested to know is why do you want to sell it? As the others pointed out, your list could be of great value to you should you choose to keep it for yourself. You could earn more money by building and nurturing relationships with the leads than simply selling them.
Are you crazy....! why you sell this ? keep this for your future. May be it helps you a lot through money. If this are not spamming it's valuable for you.