Why is Doctor Who merchandise so scarce to find anywhere?

[Hawkee]

Since Doctor Who began it's recent season last year I'm noticed that Doctor Who merchandise has become impossible to find and I would like to know why this is? Is it because Doctor Who has a huge fanbase of people or is it because Doctor Who has become a popular show for awhile and teenagers and older kids like it? Because the only place I have seen Doctor Who merchandise is at Hot Topic and all that they have are clothing and handbags of Doctor Who and nothing else and no other stores carry Doctor Who merchandise besides Hot Topic. A second thing I've noticed is that you never see any merchandise with Peter Capaldi or any of the other Doctor Who stars and all I see is merchandise with Matt Smith and David Tennant and Jodie Whittaker and I feel that Bradley Walsh should be part of the merchandise because he's a new Doctor Who star and deserves more time on merchandise
Do you know why Doctor Who merchandise is scarce to find in stores?
Bestie

[DadTheKing]

Hi, Bestie! Yes Dr Who merchandise does not have many stores carrying it. I think it is because BBC wants to be exclusive, so they can charge high prices, what do you think?
DTK