docs: add note about negative profit isolation (#1790)

add new note to monetization documentation
add new ignoredscope to .vale.ini

Author: TC-MO

.vale.ini

@@ -1,6 +1,6 @@
 StylesPath = .github/styles
 MinAlertLevel = warning
-IgnoredScopes = code, tt, table, tr, td
+IgnoredScopes = code, tt, table, tr, td, frontmatter
 
 Vocab = Docs
 

sources/platform/actors/publishing/monetize.mdx

@@ -98,6 +98,15 @@ where:
 
 Only paid user activity is included in profit calculations.
 
+:::note Negative profit isolation
+
+An Actor's negative net profit does not affect the positive profit of another Actor. For aggregation purposes, any Actor with a negative net profit is considered to have a profit of $0.
+
+- _Previously:_ `Total Profit = (-$90) + $100 = $10`
+- _Now:_ `Total Profit = $0 + $100 = $100`
+
+:::
+
 #### How to set pricing for PPE
 
 1. _Understand your costs_: Analyze resource usage (e.g CPU, memory, proxies, external APIs) and identify cost drivers