Buy Cheap on Forum then Sell for Profit on TradeMe

[Hermitage]

Buying something for $X and selling it for $X+$ is as old as civilisation itself. It's the basis of capitalism and it could be argued that without this entrepreneurial spirit, this country would be a lesser civilisation.

So I don’t have an issue with people buying goods and then flipping them on Trade Me for a profit... as long as they are honest with their listing.
I do however find myself taking issue with goods bought here on the NZ H&S Forum which are then quickly sold on Trade Me for 100%-200% profit. NZ H&S is a community and some of the items we sell here are offered at a cheaper price that befits a community... one that passes on to others. To find these cheaper forum items selling within the week on TMe for 2x or 3x profit can (I think) be justifiably frowned upon.

An example is a new Simmons 3-9x scope I sold on Thursday to a member who wanted a cheap optic for his son's .22 rifle. Because it was for his son I let him have it for $50 (incl postage), whereas it cost me $149 four months ago and I would have tried to get $100 for it if I listed on TMe.

Now let's use some other examples:
A set of Burris Z Signature rings purchased by member @Jwabfrog for a cheap $35 off the forum:
https://www.nzhuntingandshooting.co....s-rail-104854/

And now advertised by him as wankel8 on TMe for $85:
https://www.trademe.co.nz/a/marketpl...9?bof=LT1ga3bD

A ZeroTech 3-12x scope was also purchased by member @Jwabfrog for a cheap $200 from the forum:
https://www.nzhuntingandshooting.co....tripod-106866/

And now advertised by him as wankel8 on TMe for $325:
https://www.trademe.co.nz/a/marketpl...0?bof=LT1ga3bD

I'd be interested to hear other opinions as I'm sure there will be those who disagree with me.... 'old-mate Jwabfrog is just making a few extra dollars to supplement his pension' some of you may say.

So what are your thoughts on this practise?