Ive recieved an offer for my set of Aerial 7T speakers of $700.00. Should I accept?

Unfortunately, you are getting some very bad advice here from people that know about speakers but not economics. You can only get what the market will bare, period. I would market your speakers in more places to see if you get a better offer, if not, I would take the 700 or not sell. Pretty simple choice. It doesn't matter what they cost new, or what you paid for them. You now can only get what someone else will pay you for them, in this case 700. I would try and sell them on other places such as eBay, Craigslist, letgo, next door, mecari. If you get no meaningful offers, you have answered you own question. What the speakers are worth is up to someone else, not you; you can only accept the offer our not.

The answer is a big no!, there is people that spend all day everyday looking for suckers to buy from and make money off of you!,  lol!, I just got a $250.00 offer on a turntable that's worth $700.00!, frankly,  I'm not shy, told him  That his offer was an insult!, so is the one you have! 

Wow. Take a peek on hifi shark of expired and or sold. Avg is over 4k.

I had a pair of Aerial 7Bs for about a week. Only long enough to turn them around and out the door. I wouldn’t give you 700.00 for a pair. But good luck with your sale.

Oz

Has to be 7B's not T's. The T is a 11K speaker. You won't find a 7T out there for less than 6-7K in good condition. The 7B if in good shape and if it has the Rosewood finish should garner 41500-2K. Three years ago I sold a pair of the older 6's for $1500. Bought a new pair of 5T's. Only took 2 weeks to sell the Aerials.