Well kind of but it was a while back.
When it first came about the price was 1 million Baht for a lifetime membership
Then it went to 2 million Baht for 20 years for a while
I think this is when it really stagnated
Nothing changed with the 2 million baht offering - it stayed on offer until now.
Then they introduced the 5 year Easy Access membership for just 500k Baht - same price per year but you could just buy it every 5 years. I think the 'benefits' were slightly reduced from the 2 million baht membership and there was/is no annual fee with the 5 year membership.
At this point there were only 2 membership types available if I remember correctly, the 500k 5 year Easy Access membership and the 'full' 20 year membership.
Then they really shook things up by introducing the 20 year 'Superiority Extension' for 1 million Baht along with a few other different offerings (family memberships, etc) which were introduced over the years.
At some point two or three years back they increased the 5 year Easy Access membership price from 500k to 600k Baht.
Then they really shook things up again by telling us that you can 'upgrade' from the 5 year Easy Access membership to the 20 year 'Superiority Extension' for another 500k or 400k if you're a more recent member.
Now they seem to have looped back to step 2 with the highest price offering.
I doubt it will be too long before they continue on this loop and begin offering discounted memberships again once they realise they've poisoned the well.