Withdrawing from a Forex broker

Q: I have a question about withdrawal from a broker. I know FOREX trading is a separate issue, but lets say you do.

My question isn't about FOREX specifically, its about withdraw. Lets say our first initial deposit is $1000, then you make profit and your account becomes $5000. Now some brokers will say that first you have to withdraw your initial deposit, then you can withdraw your profit. This is haram. But if the broker lets me take all my money, then its halal. Please explain why the first scenario is haram.

Selling one's share of a business at a higher price

Q: I own a 50 % share in a barbershop business and my partner wants to buy my share out. My portion cost me R30 000 18 months ago when we started the business. I earn between R5 000 and R6 000 profits per month for my portion. I would like to know that if I agree to sell my share will I be able to ask for a higher price than what I originally invested. I was looking to ask for R75 000 as I am earning well monthly from my dividend.