I think it is only about time that there will be many clubs interested in Bale. Actually, his performance is quite good, even he becomes the player who determines the important win in the big game previously. Unfortunately, he cannot play regularly and most time sitting on the bench because of injury or problem with the coach. Well, it is true that 32 million euros isn't expensive. There are many clubs that have the ability to buy Bale with that price. Man United, PSG, Chelsea, or even Inter Milan are possible to buy Bale in the upcoming transfer season. Just stay tuned/wait for the transfer rumors, bro.
32 million euros is affordable to most clubs, not even necessarily top clubs (like the ones you mentioned) if you look at mid-table clubs in the epl, and how much they spend on transfers, everton for example, then i think quite a lot of clubs can afford that amount, if that is truly how much Madrid want to sell Gareth Bale for.
And honestly, i don't think he should cost more than that, Bale has had a real bad spell in the Spanish capital, to think when he was bought from Tottenham, it was for a world record fee of 100 million euros IIRC; Bale needs to make a decision for the sake of his career, a pay cut or whatever, so he can start playing again, it shouldn't always be about how much is earned.