I can get in when I want, no bother. It's my wife who has the need-to-know what date if we're to get a ticket in advance for her; and a second one if we decide to come back the next day. At the moment, we're leaning towards staying over for a couple of nights to get in at the start of day (we live on the south coast) and, if we feel the need, go back the next day. That's basically £36 on tickets if we can't decide on the dates with a sufficient time margin to pre book. Or a possible £51.90 if we guess wrong and pre book, and then have to pay the full price on the door.
Yes, "profiteering" is perhaps too strong a word; but the Photography Show is set up in terms of dates and venue to lend itself to direct comparison with Focus, and on that basis, the actual visiting costs are much higher. And I can't forget that one ticket for Focus was valid on all days. OK, I've banged on about costs, but I could accept them if it weren't for the necessity to specify the date.
Summing up - Focus was flexible in terms of tickets and dates; TPS is less flexible and more expensive. That's my problem in a nutshell.