Diagramm: Warum funktioniert xtick und ytick nicht?

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\documentclass{article}
\usepackage{tikz,pgfplots}
\begin{document}
\pgfplotsset{width=15cm,height=10cm}
\begin{tikzpicture}
\begin{axis}[colorbar sampled,
    colorbar style={samples=13},
    grid=both,
    scale only axis=true,
    width=10cm,
    height=15cm,
    xtick={0,1,...,10},
    ytick={8,7,...,-8},
    xmin=0,
    xmax=10,
    ymin=8,
    ymax=-8,
    extra y ticks=  {2.5}
    ]
\addplot[
    scatter,mark=text, text mark={\rule{14mm}{5mm}},only marks,
    point meta=\thisrow{myvalue}
    ]
    table {
    x y color myvalue
    2 3 1 100
    4 3 2 3
    2 7 3 0.75
    7 7 4 45
    8 5 2 3
    };
\end{axis}
\end{tikzpicture}
\end{document}
%colorbar  horizontal
%colormap/bluered,colorbar
%%colorbar  horizontal
%colorbar/width=2cm,
 
 
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