There are good and bad outcomes from foster parenting. Being able to bridge the gap between the parent and child, to mentor the parent on parenting and helping educate them, seeing a family reunited and knowing that you played a huge part in it is a wonderful reward.
Three of my grandkids are currently in foster care/being adopted by them. One grandson is being adopted by my ex and his wife, the other 2 are soon being adopted by their foster family. They are so wonderful and they worked very hard with my daughter to help her learn the skills she needed to have to get her kids back.
Foster families can be a wonderful tool.
On the other hand. You will find in the classes that they don't lie. They tell you about some of the pitfalls that can happen. The child that comes in and has been abused...they act out, maybe by acting out things with your children, maybe by having serious mental issues that will require a great deal of time from you sitting at a therapist offices waiting for them to finish their session. You are their "fixer", it is up to you to figure out they might need glasses and that is why they are flunking school, they may have never been to the dentist and have a mouth full of rotten teeth and you have to find the dentist and make time to go to all those appointments. It may be they have issues where they are depressed and suicidal, many more scenarios.
It is a balance between the good service you are doing for them and having the ability to call it quits when it becomes too much.
My bff took my grandson is when he was taken from his dad. She had him for months before they ever got a check, you know how red tape is, he wet the bed every night. He was in elementary school. He had to shower to get ready for school every morning. She had to do 3 extra loads of laundry every day to clean his bed linens. It was too much for her. She had to have him moved even after they had discussed with him that they would like to adopt him if things didn't work out with his mom or his dad. It broke his heart but she could not deal with it. She would sit in the laundry room and just be worn out. She has livestock and sells items from them. She also works 2 part time jobs. It ended up being a good things because he is now with my ex and is getting adopted and is very very very happy.
SO, there are so many issues that can happen and that can make a foster child so needy. But if you go into this with your eyes open, with expectations of it being a positive experience you will have a much better chance of it succeeding and being a wonderful experience.