Had a MyWaitrose card for years but only shopped there sporadically until about a year ago when I moved near to one. I probably shop there every week or two, anything from £30-70 is typical. Never had a single voucher etc.
I did realise I had my marketing preferences set to "don't send me anything" earlier last year and changed that... Still nothing. I sometimes get post for the previous owners of house and see them getting vouchers; same in my old house. Plus people seem to have them in the shop - someone kindly gave me one they weren't using once (£5 off £40 spend, etc).
Just curious as to whether they send these out regularly or if you need to be a big spender!