Also there is a risk involved of getting banned from campaign if they find out it is bought account if you request change of payment address.Even worse account can get negative trust also.
I suggest op to keep account and try to get some loan instead that you can pay back with signature payment
I think you know nothing about bitmixer campaign. that is an automatic signature campaign. there is no need to ask the manager or owner to change payment address. the bitmixer will automatically followe the address of the profile.
and I don't think those guys (campaign owners) really care bout selling account or new owners.. they just judge the posts. if quality is good no problem and if a lot of spamming then you'll get banned.
The amount you have asked for is pretty much reasonable as one can earn upto 30 usd worth btc a month from such campaigns . If you are asking for this much then it is a perfect price anyone should go for .
bitmixer paying near 90$ per month. not only 30.. it is one of the highest paying and oldest campaign.
these things surely Increase account's value.