[Avodah] expensive etrog

[Ben Waxman]

  In OH 656 the Mechaber writes that if one is shopping for an etrog and 
sees two etrogim, one more mehudar than the other, you need to buy the 
mehudar (either it is mitzvah or possibly a chiyuv). However, this only 
applies if the mehudar etrog is no more than 33% more expensive. The 
language that the Mechaber uses in the "yesh omrim" is "ein meyakrim oto 
yoter m'shlish". Does this mean that it is assur to pay more or there is 
simply no need (but if you want to, you  can)? If there is no need to 
pay a lot of money for an etrog, is it really a hiddur to buy one?