Group trips are cheaper - so it`s not so expensive for you.
For one person trip to mountain for 4 hours cost 12€ (bus + skipass) or 15€ (bus + skipass + inventory rent).
Everyone is going to mountain together by bus. So its mean you don`t need to worry about riding back with car.
From Riga we are leaving at 15:30 and back in Riga we are about 23:00.
Also our company is with experience. We are not only ones saying that, our clients says the same.