Price depends on which coin you choose to buy really.
But more importantly do you believe in what the company claim they want to do with block chain And how they plan on implementing there ideas and how they plan to change the sector they are in.
Who is on the team.are they well known in there choosen field as being 1 of the top respected persons in that sector.
It depends on how much you want to research a certain coin.
You could spend 0.10p or a few thousand ££
It's the same as investing in a new start up company really.
And the coins are essentially shares.