Hmmm, I can't speak for Mondays, but I have been working on the pier, (if you can call it working) every Tuesday and Weds in February. I can't remember seeing the gates being shut after 10am.
However, what often happens is that it seems like nice weather at the landward end, but the pier is actually getting battered by dangerous winds at the other end of the pier.
Also, you will find patches of frost which don't clear all day. (Health and safety again)
As far as shops are concerned, almost all have been open since mid feb. I would say 90% of them.
Only the kiddy rides are closed, but they will be open weekends, and some weekdays before Easter.
They need a lot of staff you see, and the concessionaire can't cover his costs before end March. No demand.
The cafe and bar have been open every day since mid feb.
Things are not perfect, but hope that helps.
Anyone need any natural remedies, gifts etc...you will find me there 6 days a week!