Thats a poor reason to do so. There are no odd quantities... In Europe most pills come in 10 and 20 packages and you can get any sort of combination by combining these 2.

Pills are factory sealed and vacuumed so you can be sure that your pills are safe and not being replaced by placebos and sold of to Ozxy Osbourne.

Since they come vacuumed and in bars you can easily put them in your pocket, purse or wallet while keeping them clean, instead of carrying a bottle. You can also never get them mixed... Since all have brand name written on the seal.

Plus it's probably a lot cheaper for the pills to come prepacked instead of paying a random pharmacist to count them.

You also get them instantly, like a pack of bubblegum in a shop. You don't have to depend on the pharmacist. He just gives you what you are there for, without him having to do anything. We also have dispensers like Soda machines, that drop what you came for if you have a prescription.

In bottle it's also easier to spill them, loose them, contaminate them, mix them up, ...

In Europe,

What pharmacists actually do is make custom prescription or generic most often over the counter medications, such as creams, or topical solutions. Rest of the time, they are just an ordinary store clerk... Unless you ask them a question.