Tbh I don’t know why , I’m only small fry in terms of buying materials but I’m always on it keeping note of cost of basics , it’s happened already and the penny has dropped for me , tbh my op I was saying to my cousin what’s the big deal but then when I checked all cost comparisons that’s when it became clear , multi is just an example £5.50 merchants £6.20 b and q
Beads 50p to £1 merchants, £2 b and q
Dry wall £7.50 merchants, £10 b and q
Never mind mf, soundblock , fireline, acoustic roll, pir boards, even a bag of magnetic is near on £100 at b and q and £66 at merchants