The volunteer who works on the adoption board said to me the other day that while most fosters and adopters are good, there are a few who don't respond to the others emails. Of course, it is understood that people are working and don't respond every day, which the volunteers do take pains to point out to people who want to adopt.
However if weeks go by and complaints start coming in because the foster still has not responded, it does cause problems. Some adopters for example are fixated on certain kittens or cats and will not consider adopting others while that cat is still up for adoption. This means if a popular kitten is on the board, other cats may not have a chance till that cat is adopted out. In the meantime, seven or eight potential adopters are all waiting for one foster who will not respond.
For another, people will think the board doesn't work and deprive other kittens of a chance of getting adopted. One potential adopter accused the volunteer of posting non-existent kittens that were cute to 'lure' people to the board.
Recently a woman posted some cats on the board, saying she would send them to be killed if they weren't taken and the responses came flooding in. She didn't reply and the potential adopters complained. The adoption team person called her. When the foster saw the emails, she said she couldn't cope with all the people who wanted the cats now. You just can't please everyone.