to hold onto voting rights ( because b shares don’t have any ) so b shares will be traded more frequently.
the a shares that come with voting rights will allow the person owning the shares one vote per share. this is where ownership of a company comes into play. if you own more than 50% of the shares of the company then you have a controlling vote. this is obviously a bad idea for a company, so it’s normal to only release 10% of the total shares to the public.
shares can climb and fall in value, but should the price get too high so they won’t be traded as much 