Originally Posted by Chloe
But they didn't always do that.
In which case their website is lying
Of course they didn't always do it.
Pre-2001, when the Slams only had 16 seeds, Wimbledon used to seed players outside of the top 16 on a regular basis. Whatever method they used during that time, it appeared to be loosely based on ranking points.
After the Costa-Corretja-Ferrero boycott of 2000, the four Slam tournaments decided to deal with this situation with a compromise. All four Slams would increase to 32 seeds. Each Slam reserves the right to re-order the 32 seeds in any way, except that those 32 seeds must be the 32 highest-ranked players who entered the tournament.
Of course now we know that Wimbledon employs some sort of seeding formula. The only thing is that we don't know what the formula is - they usually don't disclose that information. However, when the actual seeds list is published, it doesn't take a lot of mathematical skill to reverse-engineer the results to obtain the formula.