Depends what you mean by 'much'. Got a lot of repeats on UK Gold in the 90s, one episode on C5 in about 2004, another on BBC in 2006, eight episodes on BBC in 2010, and a further one on BBC in 2014. So, while not a massive amount, it's not been completely ignored.
Not that it matters much now when the whole lot have been brought out on DVD anyway.
Virgin also had the first series on demand for a while.
With UK Gold, episodes were trimmed to accommodate the ad breaks so ngt an ideal to watch the series - and at that time, the reach of UK Gold was rather limited.
The 2010 repeats were scheduled very late night - maybe not completely ignored, but it rather smacks of avoiding eye contact and not wanting to be in the same room.
…No, The Goodies haven't been shown much on terrestrial TV in years and years but then neither has the Q series or Monty Python and most other comedy shows when you think about it. It's only OFAH, Dad's Army and a handful of others that have never been off our screens.
Although I was going to make a similar point to you, the more I thought about it, I can remember shows being repeated to some extent (sometimes) on terrestrial - e.g. Sykes has just been on Forces TV, it was on Gold quite a while ago but was repeated on BBC 2 in the 1990s and I’m (pretty) sure in the 1980s. Q has been repeated (albeit in compilation form) on the Beeb and Monty Python, going from memory, was repeated in the 1980s and early 1990s, followed by BBC 4. BBC 4 showing all the remaining episodes of Till Death Do Us Part, means that series has had considerably more repeats than The Goodies on a BBC-branded channel in the last 41 years, which I feel puts into context how little comparatively the latter has been shown.
A better comparison for The Goodies would be Dick Emery; massively successful and a big hit with viewers, but after his death, his programmes have only been repeated on UK Gold. That it took the BBC 26 years after they left to repeat a single Goodies episode is unusual compared to how its repeated other successful shows that still had audiences (the 2010 episodes had excellent figures for the time slot). The dealings that Network had with the Beeb over the first two DVD releases sounded like a complete nightmare that I’m amazed that the complete collection came out - although I understand that the BBC aren’t obstructive over licensing as they were.