Es No sé por qué. En esta oración, por es una preposición que expresa causa o motivo y qué es un pronombre interrogativo 1 que representa aquello que se ignora. Esta frase es equivalente a por cuál motivo, por cuál causa. La palabra porqué es un sustantivo que significa razón, motivo, causa y no se podría usar en una oración como la que propones. Sí sería posible en cambio en una ...
Además, no lo dije por gusto; lo dije a modo de queja, ya que, por desgracia, el conocimiento lingüístico es muy bajo, en general (conozco y he leído escritores que no saben muchas cosas que yo, sin serlo, al menos profesionalmente, sí sé; claro que ellos también deben de saber cosas que yo no, sería lógico, por eso son escritores).
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