Is the dealer a volunteer in Shamir secret sharing scheme? In this Paper, Shamir secret sharing scheme  there is one dealer and n players. The dealer gives a share of the secret to the players, but only when specific conditions are fulfilled will the players be able to reconstruct the secret from their shares. The dealer accomplishes this by giving each player a share in such a way that any group of t (for threshold) or more players can together reconstruct the secret but no group of fewer than t players can. Such a system is called a (t, n)-threshold scheme (sometimes it is written as an (n, t)-threshold scheme).
I found that everyone who is participating in the secret sharing scheme has some benefit. For suppose, participants can able to get shares and reconstruct the secret, which they didn't know in prior. But, for a dealer, I feel that there is no benefit or purpose for itself to participate in the whole system since the dealer knows all the things in prior and is just doing its role to make the scheme work.
Is it true? Is the dealer a volunteer in Shamir secret sharing scheme?
If no then what is the purpose for him to involve in the scheme?
If no then what is the purpose for him to involve in the scheme?

This sort of &quot;why would someone perform this protocol&quot; question is something that crypto does not address.
Perhaps the dealer is the author of his own will, and he is delivering shares of it to his inheritors (for them to recombine after his untimely death).  Perhaps he is the owner of a cryptocurrency purse, and is distributing shares of his private key to save as backups (so that, even if one of his backups is stolen or lost, he's still safe).  Perhaps he is an HSM, and is distributing shares to the key that unlocks the administrator account.
To the protocol, the &quot;why&quot; question doesn't really matter.