No I don't think you should have to pay for your daughters wedding. I think it's a massively outdated concept for a young woman's parents to have to pay for a wedding for two fully grown adults who have their own income and home already.
I don't actually know why or how this concept ever started. Me and DH have been married over a quarter of a century now, (got married in the mid 1990s,) and my parents and his weren't very rich and we paid for our own wedding. The cake, the photographer, the wedding dress, the two bridesmaids dresses, the groom and best man outfits, the reception meal/wedding breakfast for 42 people, the venue, the flowers, the ceremony, and our honeymoon. In the mid 1990s this cost us around 5 thousand pounds.
We were both well educated professionals on quite decent salaries, and had our own home, and there's no way in hell that we would have expected our parents to have paid for our wedding. Back in the 1980s three or four young women I knew and two of my cousins (who are 8 to 10 years older than me) had their parents pay for their wedding, and all but one went into quite a considerable amount of debt to do it... Why? just to show off? Daft!
Our daughter is getting married in September this year, and the cost is coming to around 8000 pounds. She and her fiance are paying half - so 4000 pounds, her fiance's parents are contributing 2000 pounds, and we're contributing 2000 pounds. Both my daughter and her fiance made it clear to myself my husband and his own parents that they didn't want anything towards it ... but both me and my husband and her fiance's parents WANTED to contribute something.
2000 pounds is not a drop in the ocean and it's a decent amount of money - but I feel that it's fairly affordable for quite a lot of people. (For a contribution towards their daughter or son's wedding.) I mean going back to the 1980s again, a couple of families I knew paid 8,000 to 10,000 pounds for their daughter's wedding - 35 to 40 years ago! Absolutely bloody ludicrous considering you could get a house for about 20,000 to 25,000 pounds at that time. Why ??? Just to say oh 'look how rich we are?' (They weren't!) Paying 8000 to 10,000 for a wedding back then is like paying £40,000 to £50,000 now! Bonkers!
It is no longer the DUTY of the bride's parents to pay - thank GOD. Just as well seeing as how many people are brassick now!