BXP: 21st-23rd of February

Wow, I am surprised at the lack of buyable training. O_o
I guess some people really hate slow skills.

That, and the fact that buyables are near pointless during these weekends as the prices are 2-4x so it negates the xp gain.

That is definitely an exaggeration. I bought planks for construction for ~950gp, compared to a month ago at like ~720gp. That is ~30% increase, far from an 100%-400% that you said. I am sure a few buyables could get into that range, most notable summoning. In the case of summoning though, the longest parts is gathering the charms so even if you pay 2x the price and 2x the xp, it is still an advantage over usual training. The majority of buyables would not be like that though.

Just wanted to point that out since I have heard wild figures thrown around like that a fair amount.