God never shows favoritism. He loves everyone the same. Question is, will we still be faithful and still love him, even when he chooses not to heal? Or is our love conditional? God's loves us unconditionally....even when we sin against Him.
Some things we are not meant to know until we cross over. There can be lots of reasons that people are not healed, so I have to wonder what is up with some people. Something that comes to mind, are people that say they love God and go to church every Sunday then live like the devil the rest of the week. I don't think God appreciates that. Or sometimes people just go to God when they want something from him, as if he's their personal Genie In the Sky, to be there at their every beck and call.
There have been times when God has healed me and times he has not. His infjnite love and care are more than enough for me, even when I am not healed. My love for him is not based on his performance. When God chooses not to heal, I can focus on all the blessings He has given me. And what I have is the promise of the presence of God as the Holy Spirit living within me, filling me, teaching me, helping me, and guiding me, with kindness, love, and faithfulness.
Here's something else to ponder. If God healed everyone that ever asked, all the time, then I think we would take God for granted and our healings wouldn't mean near as much. Sometimes us humans can get greedy and even forget to thank the One who loves us and cares about us the most...Jesus.