It's not like the transaction fees are too high to cover if one has the money; doing so will only be a waste of money that can be used to invest in Bitcoin. Imagine spending a minimum of 1$ on Bitcoin every day in a month; it's $30. It would be better if that $30 were invested into Bitcoin every month for 5 years; it would turn out to be a good investment with good returns.
He can buy Bitcoin daily if he want but he doesn't have to send his Bitcoin to his private wallet. That will minimize his transaction fees of withdrawal. But we should have a schedule when we buy Bitcoin including thinks about the transaction fees. No matter what, we should know many things before we start buy Bitcoin so we know what we do.
I prefer invest in Bitcoin monthly using certain amount so I need to allocate that monthly to buy Bitcoin. 5 years will be a good long term plan to have Bitcoin investment.