Re: picking up sick children from school - I honestly believe that most parents do their best here. If you work, particularly if you work more than an hour's drive from your child's school, it may not be possible for you to get there in under an hour if they are sick. Yes, you can put alternative arrangements in place, but even these can fall through from time to time.
Of course it is entirely unacceptable if a parent cannot be bothered to pick up their sick child, or if they send them into school knowing they are ill - but aren't these sorts of parents in the minority?
Re: expensive items in school - yes, it's best if the child doesn't take expensive stuff into school - but when the stuff is mandated by the school (like the £30 book bag mentioned on another thread), the parents don't have any choice in the matter. Ds1's senior school had eyewateringly expensive sports kit, and insisted on a uniform kit bag too - and the boys were not allowed to take their kit bags into class or the library or the dining hall with them (for very good reasons - space, safety etc), but this meant that the bags were piled up on shelves provided round the school, and people were forever picking up the wrong bag. And it made it very easy indeed for the school 'jokers' to carry out a popular prank, involving taking someone's PE kit bag, and hiding the items all over the school!
I didn't expect the school to replace ds1's PE kit when it went missing the first time - even though it went missing because he was obeying school rules - but the second time it went missing, I did go to the school and complain, because replacing over £100 worth of PE kit over and over again was not something I wanted to have to do! I wanted the school to know it was a problem (so they could try to crack down on the 'jokers'), and surely most people would be a bit pissed off at having to replace expensive kit not once but twice!
I do think that schools need to look at uniform requirements. When we lived in England, ds1 and ds2 went to schools with very strict uniform requirements - expensive blazers, specific PE kit (rugby shirt and shorts, specific rugby socks, indoor PE kit, two pairs of trainers - indoors and outdoors, and rugby boots, plus logoed kit bag and valuables bag), etc - and we complied with that. When we moved to Scotland, the uniform was much less strict - black trousers, white shirt, school tie, and either black v-necked jumper, sweatshirt, cardigan or zippered sweatshirt - no hoodies, and you must be able to see the knot of the tie, and PE kit was t-shirt and shorts - only rule was no football colours. It was so much easier to buy - and far less stressful too. Ds1's school blazer, at his old school, was dry-clean only, so it was a nightmare if it got dirty - at his new school, I bought a couple of cheap black sweatshirts, and threw them through the wash when necessary.
And whilst I appreciate why schools insist on strict uniforms, I have to say that, in my experience, the standard of education and behaviour at both schools was pretty similar - the only difference was that one looked like a private school, and the other didn't. I don't think the image had any real bearing on the quality of either school.