It's more expensive to go in half cocked and fail to persuade the court of sufficient risk of death or injury...
But, if it was me making that application, the reason I'd go to the lengths they have is to punish the goons who have been utter cockwombles by parading their images all over social media, no doubt to make up for the overwhelming sense of inadequacy their small penis brings and to try and get my costs back.
If they issued for damages, they'd have to issue against each person separately and they'd potentially struggle to establish causation of loss, so would conceivably be limited to nominal damages. Even if they could establish some financial loss, the claims would most likely be allocated to the small claims track where solicitors costs are restricted to peanuts - they'd be lucky to get £80. Peel would pay their solicitor the difference and be unable to / have no prospect of recovering them. Also, you're looking at 18 months to get a claim for damages through the system at the moment.
So, issue a High Court Application and suddenly you're in the realm of big costs, which each of the defendant's is liable to pay (and not just their share, they'll pin them onto whoever they can get the money out of). Those costs are much more than damages would have been.
Also, think about the insurance Peel has to pay. If they're aware there are intruders and these things are well publicised, on a site like that, their insurance will go through the roof. So, the cost of doing an application like this is going to be a much cheaper alternative to increased premiums and will give them / their insurer a defence that they have done everything reasonably possible to put someone off trespassing... in the event some goon manages to injury themselves and sues in negligence, because they will - they're goons.
And, also, it's funny making goons cry. They're not difficult to track down either (well, they don;t even make it hard... "Exploring with small penises spaffs..."