The thing is, this is all a public service, so the only way to ensure nobody is ever out of pocket for it would be to possibly increase taxes so that the government could pay everyone their usual day rate- and I think people would be complaining just the same here if taxes were being increased. In addition, from a “fairness” perspective, how fair is that? That you could have 2 people doing the same jury service at the same time and one claims £62 a day as that is their typical day rate, while the other claims £270 as that is their typical day rate? Then you’d have people kicking off that it’s not fair that all are not paid the same for doing the same role during that time!
For the first 10 days of jury service you can claim £65 per day, if you are required for more than 10 days then you can claim £129 per day.
Again, I feel quite sure that if it was a member of your family who had been wronged and you, as a family, were waiting for their murderer/attacker/burglar/drunk driven etc to be brought to justice, you would be kicking off just the same if you were having to wait weeks and weeks because everybody is refusing to do jury service. Similarly if you were in a cell awaiting trial, especially if you are innocent, you would be extremely unhappy about having to wait an extra few weeks because of a lack of jurors.
There is no magic answer for this, but it’s an extremely important role. Many (I think most) employers do now pay you the top up if you have to do jury service and OP hasn’t clarified if her partner has checked this, so it may be a non issue