You require people to pay dues to be a party member, and you require party membership to vote in the party's internal selection process.

Those whom the Gods wish to destroy They first make mad. -- Euripides

It has nothing to do with requiring people to pay to vote.

This is an internal party primary in which card-carrying members of the party choose the party's candidate. To be a member, you pay a membership fee. You also don't just show up and take out a card to be able to vote. You have to be a member from before (I don't remember which date) and to have met and introduced yourself to your local party section so you are known in the party as a member.

To supplement afew: in Europe parties are supposed to be about groups of people sharing an ideology or general outlook. It's not for anyone to vote on who represents their views best. If someone doesn't feel represented, s/he could (in theory) form his/her own party. (In practice though, a lot of less obvious obstacles exist.)

_{*Lunatic*, n.
One whose delusions are out of fashion.}