Why are Mike Pence, Chis Christie etc bothering?

It is difficult to fathom why people like Mike Pence and Chris Christie and other Republican would-be presidents are going for it this time round. I can see why Ron DeSantis decided to have a go because he at least has a sporting chance of unseating Donald Trump from the throne - though pretty long odds - but the others really have no chance at all. Pence has put in the paperwork for the presidency which is the first step before the formal announcement. But does he really think he is going to get any more than, say, 5-10 per cent of the nomination vote at the end of the day? And Chris Christie, also due to make his play for the White House, is pretty much a busted flush. He will attract some Republican votes because he generally makes a lot of noise but if he starts to bash Trump he will get nowhere. Mike Pompeo sensibly decided to postpone his bid for the White House until 2028 because he presumably recognised that for 2024 it would be a waste of his time, energy and money and other people's money. Pence never had a national following but will probaby attract the very conservative voter who lives by the Bible but he will never have the mass appeal needed to win the Republican nomination. Nikki Haley will have her moments but the former US ambassador to the UN is also very unlikely to appeal to enough voters to make any more than a scratch on the nomination papers. Despite all the odds against them I guess all these candidates have a yearning to know how close they might get. But I can tell them now. All that money and publicity and ego will get you nowhere. It's going to end up Trump versus DeSantis, with Trump winning.