To make selling rights clearer, here's my understanding.
When selling rights, like the current CSE Global rights, sell at prevailing market price, which is 9vqr at $0.009.
CSE Global prices it's rights issue is at $0.33
https://sg.finance.yahoo.com/news/cse-global-announces-33-4-025523110.html
When you sell, you sell the rights to the right.
Meaning the person buying from you still need to pay $0.33(for converting each right to shares) on top of paying that current rights issue price in the market at $0.009 per right.
While you pay nothing, subscribe nothing and merely selling away the rights(of converting each rights to shares).
E.g.
if i have 5000 shares of CSE global, i'm given 1000 shares(rights).
If i want those 1000 shares(rights) to be converted to real CSE global shares, i need to pay $0.33/share(rights) or $330.
If I don't want to convert, I can sell those 1000 shares(rights) on the market at prevailing price, right now for 9vqr, which is $0.009. And thus get back $9.
The buyer of your rights, at $0.009, would still need to fork out $0.33 per rights to get the shares. The rights cost $0.33.
The buyer essentially pays a premium of $0.009 + $0.33 for getting the rights + converting the rights to shares, total cost = $0.339 per rights.
In other words, unless market price of CSE global shares are much higher than $0.33, it makes no sense to subscribe... essentially you can get the shares on the market for $0.33~ anyway.
Take note that if you do sell, there is brokerage fee involved and may make it a losing deal.
Example if I sell 1000 at 0.009 = $9 while i pay brokerage fee of $10-20...
In that case, you can just simply... do nothing. So nothing will happen to your original shares.