Brokers are called brokers because so many of their clients go broke, and they take commission from them as they lose their money. You will get better advice about buying and selling Bitcoin in this forum, and it is free. Timing and knowledge is everything, and there are many threads to help you to gain expertise.
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This is my reason since the first time I know bitcoin, there have been many offers from brokers to entrust my funds, but I didn't. There is a lot of risk to doing this, even if it comes from a close friend or relative, I will still make myself the sole owner. I would rather learn from my entry mistakes in the market than rely on a brokerage provider that promises a profit. Although not all brokers act detrimentally, I suggest you believe in yourself.