I want to publish on Kindle but analyze: is Kindle publishing still viable? Map KDP market: saturation, competition, Amazon algorithm changes. Calculate: books published daily, average book sales, realistic income expectations. Show me the Kindle reality: market is saturated, need volume or niche expertise. Give me the KDP strategy: publish in these niches, need this many books for income. Include: whether Kindle publishing works in 2025, how many books needed for income, and if it's worth the effort.